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Headaches can be divided into two categories: primary headaches and secondary headaches. Migraine headaches, tension headaches, and cluster headaches are considered primary headaches. Secondary headaches are caused by disease. Headache symptoms vary with the headache type. Over-the-counter pain relievers provide short-term relief for most headaches.

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    • Temporomandibular Joint Disorders (TMJ, TMD) Second Source WebMD Medical Reference...learn more »
    • Human Immunodeficiency Virus (HIV) The human immunodeficiency virus (HIV) causes HIV infection and the acquired immunodeficiency syndrome (AIDS). Symptoms and signs...learn more »
      In This Article
      Human Immunodeficiency Virus (HIV) Article
      • Human immunodeficiency virus (HIV) facts
      • What is the history of HIV, and when was HIV discovered?
      • What tests are used in the diagnosis of HIV?
      • How is HIV spread (transmitted)?
      • What are symptoms and signs of HIV infection and AIDS in men, women, and children?
      • What happens after an exposure to the blood or genital secretions of an HIV-infected person?
      • What laboratory tests are used to monitor HIV-infected people?
      • What are HIV treatments and medications? What are the key principles in managing HIV infection?
      • When should antiviral therapy be started?
      • What is the initial therapy for HIV?
      • What are nucleoside and nucleotide analogue reverse transcriptase inhibitors (NRTIs)?
      • What are nonnucleoside analogue reverse transcriptase inhibitors (NNRTIs)?
      • What are protease inhibitors?
      • What are fusion inhibitors?
      • What is a CCR5 antagonist?
      • What is an integrase strand transfer inhibitor?
      • What HIV drugs are in development?
      • What are side effects of HIV therapy?
      • What happens if the patient's viral load increases while on HIV therapy?
      • What are the risks of missing doses or stopping antiviral therapy?
      • Should patients with the flu- or mono-like illness of primary HIV infection be treated?
      • What about treatment for HIV during pregnancy?
      • What can be done for people who have severe immunosuppression?
      • What is the future for HIV-infected individuals with regards to treatment simplification and cure research?
      • What is in the future for preventing HIV transmission?
    • Brain Tumor A brain tumor can be either benign (non cancerous) or malignant (cancerous), primary, or secondary. Causes and risk factors...learn more »
      In This Article
      Brain Tumor Article
      • Brain tumor facts*
      • What is the brain?
      • What are the tumor grades and types?
      • Tumor grade
      • Types of primary brain tumors
      • What are the risk factors for brain tumors?
      • What are the symptoms of a brain tumor?
      • How are brain tumors diagnosed?
      • What is the treatment for a brain tumor?
      • What type of surgery is available for brain tumors?
      • Radiation therapy for brain tumors
      • Chemotherapy for brain tumors
      • What about a second opinion for brain tumor treatment?
      • Nutrition during brain tumor treatment
      • What supportive care is available for patients and caregivers?
      • What about rehabilitation after brain tumor treatment?
      • What about follow-up care after brain tumor treatment?
      • Sources of support
      • Taking part in cancer research
    • Chronic Fatigue Syndrome (CFS or SEID) Chronic fatigue syndrome (CFS) or systemic exertion intolerance disease (SEID) is a debilitating and complex disorder...learn more »
      In This Article
      Chronic Fatigue Syndrome (CFS or SEID) Article
      • Chronic fatigue syndrome (CFS) or systemic exertion intolerance disease (SEID) facts
      • What is chronic fatigue syndrome (CFS or SEID)?
      • What causes chronic fatigue syndrome or systemic exertional intolerance disease?
      • What are risk factors for CFS/SEID?
      • What are systemic exertion intolerance disease or chronic fatigue syndrome symptoms and signs?
      • What are CFS/SEID symptoms in men?
      • What are SEID/CFS symptoms in women?
      • How is chronic fatigue syndrome (or systemic exertion intolerance disease) diagnosed?
      • What is the treatment for CFS/SEID?
      • Is there a cure for CFS/SEID?
      • What is the prognosis (outcome) for CFS/SEID?
      • Is it possible to prevent CFS/SEID?
      • Where can people find additional information about CFS/SEID?
    • Common Cold The common cold (viral upper respiratory tract infection) is a contagious illness that may be caused by various viruses. Symptoms...learn more »
    • Dehydration Dehydration is the excessive loss of body water. There are a number of causes of dehydration including heat exposure, prolonged...learn more »
      In This Article
      Dehydration Article
      • Dehydration facts
      • What is dehydration?
      • What causes dehydration?
      • Dehydration pictures
      • What are the signs and symptoms of dehydration?
      • What about dehydration in children?
      • How is dehydration diagnosed?
      • How is dehydration treated?
      • Can I treat dehydration at home?
      • What are the complications of dehydration?
      • Can dehydration be prevented?

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Terms related to Headache:

  • Pain in the Head